Developer shares layered security guide after accidentally leaking database password on GitHub

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A developer building a personal side-project discovered their database password had been hard-coded and committed to a public GitHub repository, prompting an urgent cleanup of the codebase. The incident led them to research and combine three core security practices: storing secrets in environment variables or cloud secret managers instead of source code, using Let's Encrypt with Certbot for automated TLS certificate management, and configuring firewalls to deny all traffic by default except explicitly required ports. Rather than treating these as separate tasks, the developer reframed them as interconnected layers of a unified defense strategy. The resulting guide includes before-and-after code examples in Python and Nginx to illustrate each fix in practical terms. The key takeaway is that even hobby projects carry real security risks and benefit from the same foundational protections used in production systems.

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